package org.dstadler.jgit.api;

/*
   Copyright 2013, 2014 Dominik Stadler

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */

import org.dstadler.jgit.helper.CookbookHelper;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevWalk;

import java.io.IOException;

/**
 * Simple snippet which shows how to use RevWalk to read tags
 */
public class ReadTagFromName {

    public static void main(String[] args) throws IOException {
        try (Repository repository = CookbookHelper.openJGitCookbookRepository()) {
            // a RevWalk allows to retrieve information from the repository
            try (RevWalk walk = new RevWalk(repository)) {
                // a simple tag that is not annotated
                Ref simpleTag = repository.findRef("initialtag");
                RevObject any = walk.parseAny(simpleTag.getObjectId());
                System.out.println("Commit: (" + any.getClass() + ")" + any);

                // an annotated tag
                Ref annotatedTag = repository.findRef("secondtag");
                any = walk.parseAny(annotatedTag.getObjectId());
                System.out.println("Tag: (" + any.getClass() + ")" + any);

                // finally try to print out the tag-content
                System.out.println("\nTag-Content: \n");
                ObjectLoader loader = repository.open(annotatedTag.getObjectId());
                loader.copyTo(System.out);

                walk.dispose();
            }
        }
    }
}
